Transcript PROTOZOA
BACTERIA SIMPLE ONE-CELLED ANIMAL LISTERIA BACTERIA COCCI • ROUND OR SPHERICAL IN SHAPE DIPLCOCCI • COCCI OCCURS IN PAIRS • DISEASES – GONORRHEA – MENINGITIS – PNEUMONIA STREPTOCOCCI • COCCI OCCURS IN A CHAIN • DISEASES – SEVERE SORE THROAT – RHEUMATIC FEVER STAPHYOLCOCCI • COCCI OCCUR IN CLUSTERS OR GROUPS • INFECTIONS – BOILS – WOUND INFECTIONS – TOXIC SHOCK BACILLI • • • • • ROD SHAPED SINGLES, PAIRS OR IN CHAINS FLAGELLA SPORES DISEASES – TB – TETANUS, DIPTHERIA AND TYPHOID Anthracis Spores 1 Anthracis Vegetative cells in monkey spleen Anthracis spore 2 Anthracis vegetative cells and spores SPIRILLA • • • • SPIRAL OR CORKSCREW COMMA-SHAPED VIBRIO CORKSCREW SPIROCHETE Diseases – syphilis – cholera PROTOZOA ONE CELLED ANIMAL PROTOZOA • ONE CELLED ANIMAL • FOUND IN DECAYED MATERIALS AND CONTAMINATED WATER • SOME ARE PATHOGENIC AND CAUSE DISEASE PROTOZOA DISEASE • • • • MALARIA, AMEBIC DYSENTERY TRICHOMONAS AFRICAN SLEEPING SICKNESS FUNGUS •SIMPLE , PLANTLIKE ORGANISMS •LIVE ON DEAD ORGANIC MATERIAL •Yeasts •Molds FUNGAL DISEASES • • • • • RINGWORM ATHELETE’S FOOT VAGINITIS THRUSH HISTOPLASMOSIS THRUSH RICKETTSIAE • PARASITIC MICROORGANISMS • CANNOT LIVE OUTSIDE THE CELLS OF ANOTHER LIVING ORGANISM • FOUND IN FLEAS,LICE, TICKS, AND MITES • TRANSMITTED TO HUMANS FROM BITE FROM THESE INSECTS RICKETTSIAEL DISEASES • TYPHUS FEVER • ROCKY MOUNTAIN SPOTTED FEVER VIRUSES •SMALLEST OF MICROORGANISMS •CANNOT REPRODUCE UNLESS THEY ARE INSIDE ANOTHER LIVING CELL •SPREAD FROM HUMAN TO HUMAN THROUGH BLOOD AND BODY FLUIDS VIRAL DISEASES • • • • • HEPATITIS B AIDS COMMON COLD MEASLES MUMPS • • • • • CHICKEN POX WARTS HERPES POLIO INFLUENZA FACTORS REQUIRED FOR GROWTH • • • • WARM ENVIRONMENT DARKNESS SOURCE OF FOOD AND MOISTURE OXYGEN – AEROBIC ORGANISM • REQUIRES OXYGEN TO LIVE – ANEROBIC ORGANISM • LIVES AND REPRODUCES IN ABSENCE OF OXYGEN HOW DO PATHOGENIC MICROORGANISMS CAUSE INFECTION AND DISEASE • Produce poisons called toxins – bacillus tetanus – toxin that damages the CNS • allergic reaction – runny nose, watery eyes, sneezing • attack and destroy living cells – protozoa - malaria – rbc rupture CLASSIFICATONS OF DISEASES AND INFECTIONS • ENDOGENOUS • EXOGENOUS • NOSOCOMIAL • OPPORTUNISTIC CHAIN OF INFECTION • factors that must exist for disease to occur and spread • CAUSATIVE AGENT • RESERVOIR • PORTAL OF EXIT • MEANS OF TRANSMISSION • PORTAL OF ENTRY • SUSCEPTIBLE HOST The Chain of Infection As healthcare professionals, it is important to understand two facts about infection: 1.The various ways infection can be transmitted. 2. The ways the infection chain can be broken. There are six links in the chain of infection: 1st - The Infectious Agent - Any disease-causing microorganism (pathogen) Infectious Agent The Chain of Infection 2nd - The Reservoir Host -The organism in which the infectious microbes reside The Chain of Infection Infectious Agent Reservoir Host What are “Carrier Hosts?” Hosts that do not show any outward signs or symptoms of a disease, but are still capable of transmitting the disease are known as carriers. 3rd - The Portal of Exit -Route of escape of the pathogen from the reservoir Examples: respiratory secretions, blood exposure, breaks in skin The Chain of Infection Infectious Agent Reservoir Host Portal of Exit 4th - The Route of Transmission -Method by which the pathogen gets from the reservoir to the new host The Chain of Infection Infectious Agent Reservoir Host Portal of Exit Mode of Transmission Transmission may occur through: Direct Contact Air Insects 5th - The Portal of Entry -Route through which the pathogen enters its new host Respiratory System Gastrointestinal System Urinary & Reproductive Tracts Breaks in Protective Skin Barrier The Chain of Infection Infectious Agent Reservoir Host Portal of Exit Portal of Entry Mode of Transmission 6th - The Susceptible Host -The organism that accepts the pathogen The support of pathogen life and its reproduction depend on the degree of the host’s resistance. Organisms with strong immune systems are better able to fend off pathogens. Organisms with weakened immune systems are more vulnerable to the support and reproduction of pathogens. The Chain of Infection Infectious Agent Reservoir Host Susceptible Host Portal of Entry Portal of Exit Mode of Transmission ENDING THE CHAIN OF INFECTION • If any part of the chain can be eliminated the spread of disease or infection will be stopped. • Follow practices to break chain • prevent transmission of disease How to interrupt the chain of infection: -The essential part of patient care and self-protection. 1. Pathogen Identification -Identification of infectious agent and appropriate treatment 2. Asepsis and Hygiene -Potential hosts and carriers must practice asepsis and maintain proper personal hygiene Aseptic Techniques • Major way to break chain of infection • Two main terms – Asepsis • Absence of disease producing micro-organisms or pathogens – Contaminated • Any object or area that may contain pathogens ASEPTIC TECHNIQUE • Maintaining cleanliness and eliminating or preventing contamination Common Aseptic Techniques • Hand-washing • Good personal hygiene • Use disposable gloves when contacting body secretions or contaminated objects • Proper cleaning of instruments and equipment Levels of aseptic control • Antisepsis – Prevent or inhibit the growth of pathogenic organisms – Not effective against spores and viruses – Can usually be used on the skin • Examples: – Alcohol and betadine Disinfection • Destroys or kills pathogenic organisms • Not always effective against spores and viruses • Boiling water and chemical disinfectants are used • Can irritate or damage the skin and are used mainly on objects, not people Sterilization • Process that de4stroys all microorganisms – Both pathogenic and nonpathogenic – Includes spores and viruses • Steam under pressure, gas, radiation, and chemicals can be used to sterilize • Autoclave is most common equipment used 3. Control Portals of Exit -Healthcare personnel must practice standard precautions: Control body secretions and wash hands according to protocol. 4. Prevent a Route of Transmission -Prevent direct or indirect contact by: 1. Proper handwashing 2. Disinfection & sterilization techniques 3. Isolation of infected patients 4. Not working when contagious 5. Protect Portal of Entry -Healthcare professionals must make sure that ports of entry are not subjected to pathogens. (nose, mouth, eyes, urinary tract, open wounds, etc.) 6. Recognition of Susceptible Host -Healthcare professionals must recognize and protect high-risk patients. • Cancer Patients • AIDS Patients • Transplant Patients • Infants • Elderly Patients Summary • Important for health care worker to know and use proper aseptic techniques • Prevents spread and transmission of disease. “Remember--breaking the chain of infection is the responsibility of each healthcare professional.”